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odd growth on a catt

This is a discussion on odd growth on a catt within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; One of my catt seedlings appears to be creating a sort of keiki in each ...

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  1. #1
    Janet's Avatar
    Janet is offline Senior Member
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    Default odd growth on a catt

    One of my catt seedlings appears to be creating a sort of keiki in each of its two growths. It's difficult to see because these are seedlings and therefore small. I've never seen anything quite like this and none of the other seedlings are behaving this way. Is this a sort of keiki or is it something else?
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  2. #2
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    Halloamey is offline Senior Member
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    Janet, this is a Keiki but there is nothing to worry about. The media on which orchids are germinated or rooted frequently contain artificial plant hormones like NAA or giberellic acid analogues. Hormones like NAA have a tendency to cause indefinite growth that is there is no termination of the growing pseudobulb which would have occured naturally in the absence of the artificial hormone.
    Once the plant grows and matures further, the NAA it has accumulated in its tissues will slowly be degraded and you will not see this effect. One important thing, you might have to check all your fertilizers etc that you are spraying on these seedlings, if they have plant growth stimulators etc, it can also cause this effect. Just reduce the dose if you are not sure. Once the plant has matured, it has its own set of regulatory networks that will inhibit such kind of behaviour.
    Another aspect is to look out for the pedigree of your plant, if it has a lot of epidendrum influence then you can expect to see Keikis.

  3. #3
    Janet's Avatar
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    Thanks for the explanation!! It's the only one I've noticed out of about 50 seedlings. There's no epidendrum in the cross, just cattleya and laelia.

  4. #4
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    Quote Originally Posted by Halloamey View Post
    Janet, this is a Keiki but there is nothing to worry about. The media on which orchids are germinated or rooted frequently contain artificial plant hormones like NAA or giberellic acid analogues. Hormones like NAA have a tendency to cause indefinite growth that is there is no termination of the growing pseudobulb which would have occured naturally in the absence of the artificial hormone.
    Once the plant grows and matures further, the NAA it has accumulated in its tissues will slowly be degraded and you will not see this effect. One important thing, you might have to check all your fertilizers etc that you are spraying on these seedlings, if they have plant growth stimulators etc, it can also cause this effect. Just reduce the dose if you are not sure. Once the plant has matured, it has its own set of regulatory networks that will inhibit such kind of behaviour.
    Another aspect is to look out for the pedigree of your plant, if it has a lot of epidendrum influence then you can expect to see Keikis.
    Thanks, Amey, for this insight.

    Cheers,
    BD

  5. #5
    phytochrome's Avatar
    phytochrome is offline Senior Member
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    Please keep us posted on the continued growth of this plant. I am interested to see where it goes from here.

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